Vehicle-mounted radar system, blind spot detection method and vehicle

Abstract

A vehicle-mounted radar system, a blind spot detection method and a vehicle are disclosed. The vehicle-mounted radar system includes an antenna array, a phase shifter array and a radar chip. The phase shifter array includes transmitting phase shifters and receiving phase shifters, the transmitting phase shifters are connected with corresponding transmitting antennas, the receiving phase shifters are connected with corresponding receiving antennas, the transmitting phase shifters are configured to adjust a beam direction of electromagnetic waves according to a driving condition of a vehicle so that the electromagnetic waves are transmitted to an actual blind spot, and the receiving phase shifters are configured to adjust a beam direction of echo signals so that the beam direction of the echo signals is same as the beam direction of the electromagnetic waves; the radar chip is connected with the transmitting phase shifters and the receiving phase shifters respectively.

What is claimed is: 
     
         1 . A vehicle-mounted radar system, comprising:
 an antenna array comprising a plurality of transmitting antennas and a plurality of receiving antennas, wherein the transmitting antennas are configured to transmit electromagnetic waves, the receiving antennas are configured to receive echo signals, and the echo signals are signals of the electromagnetic waves reflected back from a target;   a phase shifter array comprising a plurality of transmitting phase shifters and a plurality of receiving phase shifters, wherein the transmitting phase shifters are connected with corresponding transmitting antennas, the receiving phase shifters are connected with corresponding receiving antennas, the transmitting phase shifters are configured to adjust a beam direction of the electromagnetic waves according to a driving condition of a vehicle so that the electromagnetic waves are transmitted to an actual blind spot, and the receiving phase shifters are configured to adjust a beam direction of the echo signals so that the beam direction of the echo signals is same as the beam direction of the electromagnetic waves; and   a data processing unit comprising a radar chip, wherein the radar chip is connected with the transmitting phase shifters and the receiving phase shifters respectively, and the radar chip is configured to generate the electromagnetic waves, process the received echo signals to obtain echo information, and transmit the echo information to a vehicle-machine system.   
     
     
         2 . The vehicle-mounted radar system according to  claim 1 , wherein the data processing unit further comprises a control chip, the control chip is connected with the transmitting phase shifters and the receiving phase shifters respectively, and the control chip is configured to adjust phase shift amounts of the transmitting phase shifters and the receiving phase shifters according to the driving condition of the vehicle obtained from the vehicle-machine system. 
     
     
         3 . The vehicle-mounted radar system according to  claim 1 , wherein structures of the transmitting phase shifters and structures of the receiving phase shifters are liquid crystal phase shifters, two-dimensional electronic bandgap phase shifters, resonant ring phase shifters or MEMS phase shifters. 
     
     
         4 . The vehicle-mounted radar system according to  claim 1 , wherein the transmitting antennas are connected with the transmitting phase shifters in a one-to-one correspondence, and the receiving antennas are connected with the receiving phase shifters in a one-to-one correspondence. 
     
     
         5 . The vehicle-mounted radar system according to  claim 1 , wherein the plurality of transmitting antennas are connected with a same transmitting phase shifter, and the plurality of receiving antennas are connected with a same receiving phase shifter. 
     
     
         6 . The vehicle-mounted radar system according to  claim 1 , wherein the radar chip comprises a microwave circuit and a digital processing circuit; wherein:
 the microwave circuit comprises a waveform generator, a signal separator, a power amplifier, a low noise amplifier, a mixer, an intermediate frequency amplifier and an analog-to-digital converter, wherein the waveform generator, the signal separator and the power amplifier are connected in sequence; the low noise amplifier, the mixer, the intermediate frequency amplifier, the analog-to-digital converter and the digital processing circuit are connected in sequence; and the signal separator is connected with the mixer; and   the digital processing circuit comprises one-dimensional Fourier transform, two-dimensional Fourier transform, peak search, constant false alarm rate and angle calculation.   
     
     
         7 . A vehicle, comprising a carriage body, and the vehicle-mounted radar system of  claim 1  mounted on the carriage body. 
     
     
         8 . The vehicle according to  claim 7 , wherein the vehicle-mounted radar system is mounted at a center position of a front bumper, a center position of a rear bumper, and bottom positions of two B-pillars of the carriage body. 
     
     
         9 . The vehicle according to  claim 7 , further comprising a vehicle-machine system, a steering system and an alarm system, wherein the vehicle-machine system is connected with a radar chip and a control chip, the steering system is connected with the vehicle-machine system, and the alarm system is connected with the vehicle-machine system. 
     
     
         10 . A blind spot detection method for a vehicle-mounted radar system, comprising:
 controlling a radar chip to generate an electromagnetic wave;   controlling a transmitting phase shifter to adjust a beam direction of the electromagnetic wave according to a driving condition of a vehicle;   controlling a transmitting antenna to transmit the electromagnetic wave with an adjusted beam direction to an actual blind spot;   controlling a receiving antenna to receive an echo signal reflected by a target and transmit the echo signal to a receiving phase shifter; and   controlling the radar chip to process the received echo signal to obtain echo information and transmit the echo information to a vehicle-machine system.   
     
     
         11 . The blind spot detection method according to  claim 10 , further comprising:
 determining, by the vehicle-machine system, a current steering angle of the vehicle according to a steering degree of a vehicle steering system in response to a driving process of the vehicle;   determining a current driving voltage of the transmitting phase shifter corresponding to the current steering angle according to a lookup table of steering angles and driving voltages pre-stored in a control chip;   driving the transmitting phase shifter to work according to the current driving voltage, so that a beam of the electromagnetic wave output by the radar chip after passing through the transmitting phase shifter points to the actual blind spot corresponding to the current steering angle; and   transmitting, by the radar chip, the determined echo information to the vehicle-machine system when the radar chip detects the target in the actual blind spot; and controlling, by the vehicle-machine system, an alarm system of the vehicle to alert danger of the target.   
     
     
         12 . The blind spot detection method according to  claim 10 , further comprising:
 determining, by the vehicle-machine system, an expected driving action of the vehicle according to a gear operation of the vehicle in response to a starting process of the vehicle;   controlling, by the vehicle-machine system, the vehicle-mounted radar system to perform detection in a direction of the expected driving action;   transmitting, by the radar chip, the determined echo information to the vehicle-machine system when the radar chip detects the target; and controlling, by the vehicle-machine system, an alarm system of the vehicle to alert danger of the target; and   controlling the vehicle-mounted radar system to perform beam control scanning at each steering angle according to a lookup table of steering angles and driving voltages pre-stored in a control chip when the radar chip detects no target.   
     
     
         13 . The blind spot detection method according to  claim 11 , wherein the lookup table of steering angles and driving voltages is obtained by:
 dividing a plurality of steering angles of the vehicle according to a quantity of turns of the steering system;   determining an actual blind spot corresponding to each steering angle;   determining a beam direction of the electromagnetic wave corresponding to each actual blind spot;   determining a phase shift amount of the transmitting phase shifter according to the beam direction; and   determining a driving voltage of the transmitting phase shifter according to the phase shift amount, to obtain a driving voltage lookup table corresponding to each steering angle.   
     
     
         14 . The blind spot detection method according to  claim 11 , wherein the echo information comprises a distance, a relative speed and orientation information between the target and the vehicle. 
     
     
         15 . The blind spot detection method according to  claim 10 , further comprising:
 controlling the vehicle-mounted radar system mounted at a center position of a front bumper and a center position of a rear bumper to start detection of the actual blind spot and determine whether there is a target in the actual blind spot in response to a straight-line driving process of the vehicle.